A major train route in Essex will be closed for nine days as part of a £46m upgrade of overhead wires.
The Greater Anglia line between Wickford and Southend will be closed between Saturday, May 25 and Sunday, June 2.
There will be a limited rail replacement bus service and a reduced train service between Wickford and London Liverpool Street, and customers are advised to make alternative travel arrangements.
The Wickford to London Liverpool Street service will have shorter trains running less frequently as access to the Southend depot - where trains are stored overnight - will also be blocked by the works.
Those who hold Greater Anglia monthly season tickets or longer can use c2c services for the whole of the nine-day closure.
Network Rail is replacing 128km of overhead wires with a new auto tension system that adapts to temperature changes and will be more reliable.
More than 500 structures that support the wires at the correct height and tension will also be replaced.
The closure of the line will mean the bulk of the work will finish two months earlier in March 2020 instead of May 2020, with 11 fewer weeks of mid-week closures and six fewer weekend closures.
Meliha Duymaz, Network Rail's route managing director for Anglia, said: "We are working with Greater Anglia to make sure passengers are informed about the upgrades taking place between Wickford and Southend Victoria later this month.
"While I appreciate the inconvenience this will cause passengers, closing the line for nine days will allow us to carry out much more work compared to a series of more limited mid-week or weekend closures.
"I'd encourage passengers to plan their journey in advance or make alternative arrangements."
Jamie Burles, Greater Anglia managing director, said: "We've worked closely with Network Rail to reduce the overall impact works to carry out this important upgrade have on customers.
"We've given customers as much notice as possible of the nine days of intensive works and tried to answer all of their questions about the blockade.
"We apologise for any inconvenience the works causes and thank customers for their continued patience."
